WO2010106959A1 - 内燃機関の排気浄化装置 - Google Patents

内燃機関の排気浄化装置 Download PDF

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Publication number
WO2010106959A1
WO2010106959A1 PCT/JP2010/054097 JP2010054097W WO2010106959A1 WO 2010106959 A1 WO2010106959 A1 WO 2010106959A1 JP 2010054097 W JP2010054097 W JP 2010054097W WO 2010106959 A1 WO2010106959 A1 WO 2010106959A1
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WIPO (PCT)
Prior art keywords
exhaust
combustion engine
internal combustion
differential pressure
temperature
Prior art date
Application number
PCT/JP2010/054097
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
克成 城之内
道彦 原
Original Assignee
ヤンマー株式会社
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Filing date
Publication date
Application filed by ヤンマー株式会社 filed Critical ヤンマー株式会社
Priority to US13/257,175 priority Critical patent/US8539756B2/en
Priority to CN201080012350.XA priority patent/CN102356219B/zh
Priority to EP10753451.3A priority patent/EP2410142B1/en
Publication of WO2010106959A1 publication Critical patent/WO2010106959A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1448—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/04—Filtering activity of particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0414—Air temperature
    • F02D2200/0416—Estimation of air temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/026—Catalyst temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to an exhaust purification device for an internal combustion engine. More particularly, the present invention relates to a technique for preventing melting damage of an exhaust purification device for an internal combustion engine.
  • an exhaust purification device for an internal combustion engine having a particulate filter in the middle of an exhaust passage.
  • the particulate filter has a porous honeycomb structure made of ceramic or the like, and only the exhaust gas that has permeated through the porous walls defining each flow path is discharged downstream.
  • a technique for burning and removing particulates accumulated inside the porous wall when exhaust passes through the porous wall is known.
  • the particulate filter is not sufficiently cooled by the exhaust gas.
  • the amount of residual oxygen in the exhaust gas increases due to a decrease in the load on the internal combustion engine, excessive combustion due to residual oxygen tends to occur. Therefore, there is a problem in that the possibility of melting of the particulate filter increases.
  • the present invention has been made in view of such problems, and an object thereof is to provide an exhaust purification device for an internal combustion engine that can prevent the operation of the internal combustion engine from being continued in a state where the particulate filter is melted.
  • the particulate filter the exhaust temperature detecting means for detecting the exhaust temperature downstream of the particulate filter, the upstream exhaust pressure of the particulate filter, and the downstream exhaust pressure of the particulate filter
  • An exhaust gas purification device for an internal combustion engine comprising: an exhaust gas differential pressure detection means for calculating the exhaust gas differential pressure every predetermined time; a notification means for performing notification based on the state of the particulate filter; and a control means for controlling the internal combustion engine
  • the control means is connected to the exhaust temperature detecting means, the exhaust differential pressure detecting means, and the notifying means, and the first exhaust differential pressure and a second exhaust differential calculated after a predetermined time elapses.
  • the differential pressure change amount is calculated based on the pressure, and when the differential pressure change amount is greater than or equal to the reference change amount, or the downstream exhaust temperature continues for the reference time or more If the above degrees, a notification for requesting the operation stop of the internal combustion engine by the notification unit, or characterized in that for stopping the operation of the internal combustion engine.
  • control means is configured such that the exhaust temperature detection means detects at least once or more, a value above a reference temperature continuously for a reference time or more, or the exhaust differential pressure detection means at least once or more, When a value equal to or greater than a reference change amount is calculated, a notification requesting inspection of the particulate filter is performed by the notification unit.
  • control means is connected to a filter temperature detecting means for detecting a filter temperature of the particulate filter, and when the filter temperature detected by the filter temperature detecting means is equal to or higher than a filter reference temperature, the internal combustion engine Is not started.
  • control means continuously performs the notification requesting the inspection of the particulate filter by the notification means for a reference period or more, and when the inspection of the particulate filter is not performed, The output of the internal combustion engine is limited until the particulate filter is inspected.
  • the present invention has an effect that it is possible to prevent the operation of the internal combustion engine from being continued in a state where the particulate filter is melted.
  • an exhaust purification device 1 which is an embodiment of an exhaust purification device for an internal combustion engine according to the present invention will be described with reference to FIG.
  • the exhaust gas purification device 1 purifies and discharges the exhaust gas generated in the internal combustion engine 2 as shown in FIG.
  • the exhaust purification device 1 is provided in an internal combustion engine 2 and includes a particulate filter 10, an oxidation catalyst 11, a downstream temperature sensor 20a that is an exhaust temperature detection means, a filter temperature sensor 20b that is a filter temperature detection means, and an exhaust differential pressure detection means.
  • the exhaust pressure difference detection device 21 is an ECU 30 as a control means, a notification device 40 as a notification means, and the like.
  • the internal combustion engine 2 includes one or more cylinders, and converts energy generated by burning fuel injected into the cylinders into rotational power.
  • the internal combustion engine 2 causes the outside air supplied through the intake passage 3 and the fuel supplied from the fuel injection valves 4, 4, 4, 4 to be mixed and burned in the cylinders 5, 5, 5, 5. Exhaust gas generated at this time is discharged through the exhaust path 6.
  • the internal combustion engine 2 according to the present embodiment is an in-line four cylinder, it is not limited to this.
  • the particulate filter 10 removes particulates in the exhaust (carbon soot, high-boiling hydrocarbon components (SOF), etc.).
  • the particulate filter 10 is disposed in the exhaust path 6 of the internal combustion engine 2.
  • the particulate filter 10 has a honeycomb structure composed of a porous wall of ceramic or the like, and is configured such that exhaust gas is discharged after passing through the porous wall.
  • the particulate filter 10 collects particulates in the exhaust when the exhaust passes through the porous wall. As a result, particulates are removed from the exhaust.
  • the oxidation catalyst 11 oxidizes nitrogen compounds.
  • the oxidation catalyst 11 is disposed on the upstream side of the particulate filter 10 and promotes oxidation removal of the particulates.
  • the downstream temperature sensor 20a which is an exhaust gas temperature detection means, detects the temperature of the exhaust gas that has passed through the particulate filter 10.
  • the downstream temperature sensor 20a is disposed at a position where the downstream exhaust temperature T1 after passing through the particulate filter 10 can be detected.
  • the filter temperature sensor 20b serving as filter temperature detecting means detects the filter temperature T10 of the particulate filter 10.
  • the filter temperature sensor 20b is disposed at a position where the filter temperature T10 of the particulate filter 10 can be detected.
  • the exhaust differential pressure detection device 21 which is an exhaust differential pressure detection means detects the differential pressure of the exhaust gas passing through the particulate filter 10.
  • the exhaust differential pressure detection device 21 includes an upstream pressure sensor 21a and a downstream pressure sensor 21b.
  • the upstream pressure sensor 21a is disposed on the upstream side of the particulate filter, and detects the upstream exhaust pressure p1 before passing through the particulate filter 10 every predetermined time.
  • the upstream pressure sensor 21a may be upstream of the particulate filter 10, and may be upstream or downstream of the oxidation catalyst 11.
  • the downstream pressure sensor 21b is disposed on the downstream side of the particulate filter 10, and detects the downstream exhaust pressure p2 after passing through the particulate filter 10 every predetermined time.
  • the exhaust differential pressure detection device 21 detects exhaust differential pressure P (n ⁇ 1), exhaust differential pressure P (n), exhaust differential pressure P (n + 1) at predetermined intervals from the upstream exhaust pressure p1 and the downstream exhaust pressure p2. ⁇ ⁇ Calculate.
  • the ECU 30, which is a control means, controls the internal combustion engine 2 and controls the regeneration of the particulate filter 10. Specifically, the ECU 30 acquires the state of the particulate filter 10 detected by the downstream temperature sensor 20a, the filter temperature sensor 20b, and the exhaust differential pressure detection device 21. Then, the ECU 30 regenerates the particulate filter 10 based on the acquired state of the particulate filter 10 or controls the internal combustion engine 2 to prevent melting damage. Further, the ECU 30 controls the internal combustion engine 2 by a signal from an accelerator (not shown). Further, the internal combustion engine 2 is started and stopped by a signal from the key switch 31.
  • the ECU 30 may be configured such that a CPU, a ROM, a RAM, an HDD, and the like are connected by a bus, or may be configured by a one-chip LSI or the like.
  • the ECU 30 stores various programs and data for controlling the internal combustion engine 2 and the particulate filter 10.
  • the notification device 40 as notification means performs notification based on the state of the particulate filter 10. When there is a possibility that the particulate filter 10 is melted, the notification device 40 performs a notification requesting that the internal combustion engine 2 be stopped or the particulate filter 10 be inspected.
  • the notification device 40 includes a lamp 41 that is a visual notification unit or a speaker 42 that is an auditory notification unit.
  • the lamp 41 performs notification based on the state of the particulate filter 10 by turning on the lamp 41. Specifically, the lamp 41 performs notification for requesting the stop of the internal combustion engine 2 by lighting, and performs notification for requesting the inspection of the particulate filter 10 by blinking. Note that the notification method is not limited to this embodiment.
  • the speaker 42 performs notification based on the state of the particulate filter 10 to the worker using auditory information. Specifically, the speaker 42 performs a notification requesting the stop of the internal combustion engine 2 or a request for checking the particulate filter 10 by voice. Note that the notification method is not limited to this embodiment.
  • the ECU 30 is connected to the fuel injectors 4, 4, 4, 4 and controls the fuel injection amount of the fuel injectors 4, 4, 4, 4, thereby starting and stopping the internal combustion engine 2, controlling output, and the like. It is possible.
  • the ECU 30 is connected to the downstream temperature sensor 20a, and can acquire the downstream exhaust temperature T1 detected by the downstream temperature sensor 20a.
  • the ECU 30 is connected to the filter temperature sensor 20b and can acquire the filter temperature T10 detected by the filter temperature sensor 20b.
  • the ECU 30 is connected to the exhaust differential pressure detection device 21 and can acquire the exhaust differential pressure P (n) calculated by the exhaust differential pressure detection device 21.
  • the ECU 30 performs the second exhaust differential pressure P (n) calculated by the exhaust differential pressure detection device 21 and the first exhaust differential calculated by the exhaust differential pressure detection device 21 a predetermined time before the downstream exhaust temperature T1.
  • the pressure P (n-1) is converted into the second converted exhaust differential pressure TP (n) and the first converted exhaust differential pressure TP (the pressure when the exhaust is discharged at a predetermined temperature and a predetermined flow rate. n-1). It is possible to calculate a differential pressure change amount dP which is a difference between the second converted exhaust differential pressure TP (n) and the first converted exhaust differential pressure TP (n ⁇ 1).
  • the ECU 30 discharges the first exhaust differential pressure P (n ⁇ 1) calculated by the exhaust differential pressure detection device 21 a predetermined time ago at a predetermined temperature and a predetermined flow rate in the state of the downstream exhaust temperature T1. Is converted into the first converted exhaust differential pressure TP (n-1), which is the pressure of the exhaust in this case. Similarly, the ECU 30 in the state of the downstream exhaust temperature T1 when the second exhaust differential pressure P (n) calculated by the exhaust differential pressure detection device 21 is discharged at a predetermined temperature and a predetermined flow rate. The pressure is converted into a second converted exhaust differential pressure TP (n) which is the exhaust pressure. Therefore, the ECU 30 can calculate the differential pressure change amount dP that is the difference between the second converted exhaust differential pressure TP (n) and the first converted exhaust differential pressure TP (n ⁇ 1).
  • the ECU 30 is connected to the notification device 40 and can perform notification based on the state of the particulate filter 10 by controlling the notification device 40.
  • the ECU 30 determines whether the particulate filter 10 is melted or not.
  • the exhaust gas reference temperature T1s, the filter reference temperature 10Ts, the reference change amount Ps, the reference time ts, the reference period h, and the particulate filter 10 can be melted.
  • the melting count N that is counted when a predetermined condition is satisfied is stored. Further, an output map M1 of the internal combustion engine 2 and an output restriction map M2 for limiting the output of the internal combustion engine 2 are stored.
  • the ECU 30 acquires the downstream exhaust temperature T1, the filter temperature T10, and the second exhaust differential pressure P (n), and is calculated by the exhaust differential pressure detection device 21 a predetermined time ago.
  • a differential pressure change amount dP is calculated based on the first exhaust differential pressure P (n ⁇ 1).
  • the ECU 30 determines whether or not the downstream side exhaust temperature T1 and the duration t thereof or the differential pressure change amount dP is equal to or greater than each reference value, that is, whether the particulate filter 10 may be melted.
  • the ECU 30 notifies the requesting device 40 to stop the internal combustion engine or stops the operation of the internal combustion engine 2.
  • step S110 the ECU 30 acquires a signal for starting the internal combustion engine 2 from the key switch 31, and then shifts the control stage to step S120.
  • step S130 after starting the operation of the internal combustion engine 2, the ECU 30 shifts the control stage to step S140.
  • step S140 the ECU 30 acquires the downstream exhaust temperature T1 by the downstream temperature sensor 20a, and then shifts the control stage to step S150.
  • step S150 the ECU 30 acquires the second exhaust differential pressure P (n) calculated by the exhaust differential pressure detection device 21, and then shifts the control stage to step S160.
  • step S160 the ECU 30 calculates the second exhaust differential pressure P (n) at the downstream exhaust temperature T1 and the first exhaust differential pressure P (n-1) calculated by the exhaust differential pressure detection device 21 a predetermined time ago. Are converted into a second converted exhaust differential pressure TP (n) and a first converted exhaust differential pressure TP (n-1), which are exhaust pressures when exhausted at a predetermined temperature and a predetermined flow rate. Then, after calculating the differential pressure change amount dP, which is the difference between the second converted exhaust differential pressure TP (n) and the first converted exhaust differential pressure TP (n ⁇ 1), the control stage proceeds to step S170. .
  • step S170 the ECU 30 determines whether or not the downstream exhaust temperature T1 is equal to or higher than the exhaust reference temperature T1s. As a result, when it is determined that the downstream exhaust temperature T1 is equal to or higher than the exhaust reference temperature T1s, the control stage is shifted to step S180. If the ECU 30 determines that the downstream side exhaust temperature T1 is lower than the exhaust reference temperature T1s, the ECU 30 proceeds to step S480.
  • step S180 the ECU 30 determines whether or not the duration t in which the downstream exhaust temperature T1 is equal to or higher than the exhaust reference temperature T1s is equal to or higher than the reference time ts. As a result, when it is determined that the duration t in which the downstream side exhaust temperature T1 is equal to or higher than the exhaust reference temperature T1s is equal to or longer than the reference time ts, the control stage proceeds to step S190. If the ECU 30 determines that the duration t of the state where the downstream side exhaust temperature T1 is equal to or higher than the exhaust reference temperature T1s is less than the reference time ts, the ECU 30 shifts the control step to step S480.
  • step S190 the ECU 30 adds 1 to the erosion count N, and then shifts the control stage to step S200.
  • step S200 the ECU 30 notifies the requesting device 40 to request that the internal combustion engine 2 be stopped. Alternatively, the ECU 30 stops the operation of the internal combustion engine 2.
  • step S320 the ECU 30 moves the control stage to step S330 after obtaining the filter temperature T10 by the filter temperature sensor 20b.
  • step S330 the ECU 30 determines whether or not the filter temperature T10 is lower than the filter reference temperature T10s. As a result, when it is determined that the filter temperature T10 is lower than the filter reference temperature T10s, the control stage proceeds to step S340. Further, when the ECU 30 determines that the filter temperature T10 is equal to or higher than the filter reference temperature T10s, the ECU 30 repeatedly proceeds to step S120.
  • step S340 the ECU 30 makes a notification requesting that the particulate filter 10 be inspected by the notification device 40, and then proceeds to step 350.
  • step S ⁇ b> 350 the ECU 30 determines whether or not the period during which the notification requesting the inspection of the particulate filter 10 by the notification device 40 is greater than or equal to the reference period h. As a result, when it is determined that the period during which the notification device 40 has requested to check the particulate filter 10 is equal to or longer than the reference period h, the control stage proceeds to step S350. Further, when the ECU 30 determines that the period during which the notification requesting the inspection of the particulate filter 10 by the notification device 40 is less than the reference period h, the ECU 30 proceeds to step S130.
  • step S360 the ECU 30 switches the output map M1 of the internal combustion engine 2 to the output restriction map M2 for restricting the output of the internal combustion engine 2, and then shifts the control stage to step S130.
  • step S480 the ECU 30 determines whether or not the differential pressure change amount dP is greater than or equal to the reference change amount Ps. As a result, if it is determined that the differential pressure change amount dP is greater than or equal to the reference change amount Ps, the control stage proceeds to step S190. Further, when the ECU 30 determines that the differential pressure change amount dP is less than the reference change amount Ps, the ECU 30 shifts the control step to step S140.
  • the duration t in which the downstream exhaust temperature T1 is equal to or higher than the exhaust reference temperature T1s is reset when the operation of the internal combustion engine 2 is stopped.
  • the period during which the melting count N and the notification device 40 notifies the particulate filter 10 to be inspected is reset by inspecting the particulate filter 10.
  • the particulate filter 10 As described above, the particulate filter 10, the downstream temperature sensor 20a, which is a downstream temperature detecting means for detecting the downstream exhaust temperature T1 of the particulate filter 10, the upstream exhaust pressure p1 of the particulate filter 10, and the particulates.
  • An exhaust differential pressure detection device 21 which is an exhaust differential pressure detection means for calculating an exhaust differential pressure P (n) with respect to the downstream exhaust pressure p2 of the filter 10 every predetermined time, and a notification based on the state of the particulate filter 10 are performed.
  • the ECU 30 includes a downstream temperature sensor 20 a and an exhaust differential pressure detection device 21.
  • the first exhaust gas obtained by converting the first exhaust differential pressure P (n-1) under a predetermined condition.
  • the differential pressure based on the differential pressure TP (n-1) and the second converted exhaust differential pressure TP (n) obtained by converting the second exhaust differential pressure P (n) calculated after a predetermined time has passed under a predetermined condition.
  • the notification device 40 causes the internal combustion engine to No. 2 is requested to stop the operation, or the operation of the internal combustion engine 2 is stopped.
  • the ECU 30 detects the reference change when the downstream temperature sensor 20a continuously detects a value equal to or higher than the exhaust reference temperature T1s for a reference time ts or more, or when the exhaust differential pressure detection device 21 detects at least once or more.
  • the notification device 40 makes a notification requesting that the particulate filter 10 be inspected.
  • the ECU 30 is connected to a filter temperature sensor 20b, which is a filter temperature detection means for detecting the filter temperature T10 of the particulate filter 10, and the filter temperature T10 detected by the filter temperature sensor 20b is equal to or higher than the filter reference temperature T10s.
  • the internal combustion engine 2 is not started.
  • the ECU 30 continuously performs the notification requesting the inspection of the particulate filter 10 by the notification device 40 during the reference period h and when the inspection of the particulate filter 10 is not performed, the particulate filter 10
  • the output of the internal combustion engine 2 is limited until the above inspection is performed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
PCT/JP2010/054097 2009-03-19 2010-03-11 内燃機関の排気浄化装置 WO2010106959A1 (ja)

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US13/257,175 US8539756B2 (en) 2009-03-19 2010-03-11 Exhaust purification device for internal combustion engine
CN201080012350.XA CN102356219B (zh) 2009-03-19 2010-03-11 内燃机的排气净化装置
EP10753451.3A EP2410142B1 (en) 2009-03-19 2010-03-11 Exhaust purification device for internal combustion engine

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EP2410142A4 (en) 2017-07-19
US8539756B2 (en) 2013-09-24
US20120006009A1 (en) 2012-01-12
CN102356219A (zh) 2012-02-15
JP2010222993A (ja) 2010-10-07
CN102356219B (zh) 2014-01-08
KR20110134471A (ko) 2011-12-14
EP2410142B1 (en) 2018-10-31

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